As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE NUMBER ONE ENGINE MANUAL CAUTION LIGHT ILLUMINATED AT ROTATION, SHORTLY THERE AFTER (1500FT) TORQUE DROPPED OFF. THEN THE PROP WENT INTO FEATHER. THE MAX TORQUE REACH AT 107 PERCENT. THE CREW MANUALLY SHUT DOWN THE ENGINE. DECLARED AN EMERGENCY AND DID AN AIR TURN AROUND. CHECKED THE ENGINE CONTROL PANEL FOR FLAGS, FOUND THAT THE NUMBER ONE ENGINE CONTROL UNIT WAS FLAGGED. REMOVED AND REPLACED THE NR 1 EEC, HMU/FUEL PUMP IAW W/C’S 73-20-01R AND 76-00-01Q, OPS AND LEAK CHECKS GOOD.